<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>3.用 vue 实现数据的双向绑定</title>
</head>
<body>
    <div id="app">{{message}}</div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        const app = new Vue({
            el: "#app", // 用于挂载要管理的元素
            data: {
                //定义数据
                message: "hello,world",
            },
        });
    </script>
</body>
</html>